Thyristors Questions and Answers

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Showing 10 of 24 questions
Q1
The ________ can be externally programmed to turn on at a desired anode-to-gate voltage level.
  • A UJT
  • B PUT
  • C SCR
  • D SCS
Answer: Option B
Q2
You need a very efficient thyristor to control the speed of an AC fan motor. A good device to use would be
  • A a 4-layer diode.
  • B a PUT.
  • C a triac.
  • D a BJT.
Answer: Option C
Q3
An application of a(n) ________ is in a lighting system for power interruptions.
  • A SCR
  • B SCS
  • C diac
  • D triac
Answer: Option A
Q4
The silicon-controlled switch (SCS) is similar in construction to the
  • A triac.
  • B diac.
  • C SCR.
  • D 4-layer diode.
Answer: Option C
Q5
The ________ can conduct current in either direction and is turned on when a breakover voltage is exceeded.
  • A SCR
  • B diac
  • C SCS
  • D triac
Answer: Option B
Q6
You need to design a relaxation oscillator circuit. The most likely device to use might be
  • A an SCR.
  • B a UJT.
  • C a triac.
  • D a 4-layer diode.
Answer: Option B
Q7
You have the schematic diagram of several types of circuits. Which of these circuits most likely uses a triac?
  • A an oscillator
  • B an ac motor control
  • C a programmable oscillator
  • D an amplifier
Answer: Option B
Q8
The ________ is like a diac with a gate terminal.
  • A triac
  • B SCR
  • C SCS
  • D none of the above
Answer: Option A
Q9
You have a need to use a device to trigger an SCR. A good one to use might be
  • A an SCS.
  • B a UJT.
  • C a 4-layer diode.
  • D a PUT.
Answer: Option B
Q10
The SCR can be triggered on by a pulse at the
  • A gate.
  • B anode.
  • C cathode.
  • D none of the above
Answer: Option A

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